Men and Angels

Quid est quod dicit: Et ecce stetit in conspectu meo quasi species viri? Non enim viri sunt angeli, sed in specie virorum videntur, sicut Abraham ad quercum Mambre tres visi sunt viri, qui utique viri non erant, e quibus unus adoratur ut Dominus, unde et Salvator loquitur in Evangelio: Abraham vidit diem meum et iactatus est.   Petrus Archidiaconus  Liber De Diversis Quaestiunculis  Migne 96 1356

What is this that is said: 'And behold he stood in my eyes like the form of a man? 1 For men are not angels, but they are seen in the form of men, like Abraham at the oaks of Mamre who saw them as men who were not men, and one of whom he adored like the Lord, 2 whence the Saviour says in the Gospel, 'Abraham saw my day and rejoiced.' 3 Peter of Pisa, The Book of Diverse Questions 1 Dan 8.15 2 Gen 18.1-3 3 John 8.56